Adding another battery

I have a 2004 chevy tahoe with stock battey and stock alternator. My tahoe has a in dash DVD player and I have 3 12 inch kicker L5's I was wanting to upgrade my amp and get a couple kicker amps so that my subs will actually get pushed because the amp I have now is just not doing it. When I do add the 2 amps I am afraid it's going to suck all the juice out of my battery when I play it. So I don't know if I should just add another battery or if I have to upgrade the alternator first so it can charge 2 batteries without a problem. Just let me know what you think, any input will help, Thanks.

I have a 2004 chevy tahoe with stock battey and stock alternator. My tahoe has a in dash DVD player and I have 3 12 inch kicker L5's I was wanting to upgrade my amp and get a couple kicker amps so that my subs will actually get pushed because the amp I have now is just not doing it. When I do add the 2 amps I am afraid it's going to suck all the juice out of my battery when I play it. So I don't know if I should just add another battery or if I have to upgrade the alternator first so it can charge 2 batteries without a problem. Just let me know what you think, any input will help, Thanks.

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Here's wut i would do, have an alternator shop rewind that alternator to about 200 amps (it can be done) it should cost you around 200 and then go online and purchase the Kinetik HC 1800 battery, you will be fine thats pretty much all i did and you can see wut i have in my truck if you look at my pics on here its waaaaay more than you will be adding and everything is fine ;-) and if you want you can add a second kinetik on the passenger side near the firewall but its more money and alot of work....

Thanks for the help. What amp or amps should I get to push the three kicker L5's? If I did get the alternator rewound and added a battery do you think everything would be good enough to add 2 or 3 more subs?